1. Department of Pediatrics, Kosin University Gospel Hospital, Kosin University School of Medicine, Busan, Korea.
2. Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Pediatrics, Pusan National University School of Medicine, Busan, Korea.
4. Integrated and Respiratory Care Center for Children, Seoul National University Hospital, Seoul, Korea.
5. Department of Pediatrics, Chungnam National University Sejong Hospital, Chungnam National University College of Medicine, Sejong, Korea.
6. Department of Pediatrics, Hallym University Chuncheon Sacred Heart Hospital, Hallym University School of Medicine, Chuncheon, Korea.
7. Biomedical Statistics Center, Research Institute for Future Medicine, Samsung Medical Center, Seoul, Korea.
8. Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences & Technology, Seoul, Korea.
9. Department of Pediatrics, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Changwon, Korea.